Office Chair with Strengthened Structure

ABSTRACT

Office chair with improved structure includes: chair back, seat cushion, base frame, L-shaped connecting piece; among others, the vertical part and transversal part of the connecting piece are connected with the chair back and seat cushion respectively; there is an cylinder rod in the middle of the base frame, it coordinates with a handle to realize the lifting and dropping of the seat cushion, the vertical part and transversal part of the connecting piece are directly fixed at the back end of chair back and bottom side of chair seat respectively; in addition, there is a fixing hole coordinating with the top of cylinder rod at the corresponding position of the middle of the seat cushion on the transversal part of the connecting piece.

CROSS REFERENCE TO RELATED PATENT APPLICATION

This application claims the priority of the Chinese patent applicationNo. 200620062543.7, Which was filed on Aug. 4, 2006.

FIELD OF THE INVENTION

This invention deals with the technology field of office furniture,especially a type of office chair with the lift-and-drop seat cushion.

BACKGROUND OF THE INVENTION

Office chair, especially the office chair with the adjustable height, isone of the most widely used office equipment at present; due to itsadjustable height, its position can be adjusted according to differentrequirements of people, which makes it quite popular with the public.Diagram 1 shows the structure of the office chair of this type atpresent, it includes: chair back 01, seat cushion 02, base frame 03 andL-shaped connecting piece 04; several support installed with rollers aremolded on the outer fringe of the base frame 03 and the cylinder rod 05is set in the middle of the base frame 03; a U-shaped chassis 06 isfixed at the bottom side of the chair seat 02; the vertical part 041 ofthe connecting piece 04 is fixed with the chair back 01 and a slenderbar member 043 is projected on the front end of the transversal part042; this slender bar member 043 is fixed on the chassis 06 by screwsand there is a run-through hole coordinating with the top of cylinderrod 05 on the bottom of the chassis 06. The front end of the handle 07goes through the side of the chassis 06 to coordinate the motion bar 08of the cylinder rod 05, the motion bar 08 is connected with a piston bin(not shown in the drawing) in the cylinder rod 05, when push the handle07 down, the motion bar 08 makes the piston bin action, thereby toadjust the height of the chair seat 02.

With this structure, the height of the seat cushion 02 of office chaircan be adjusted; but it has the shortcomings of complex structure, highproduction costs and inconvenient installation for consumers.Furthermore, due to the fact that the transversal part 042 of connectingpiece 042 are connected to the seat cushion 02 via the slender barmember 043 and chassis 06, the intensity is insufficient; when theconsumer is leaning on the chair back 01 and rocking back and forth, theslender bar member 043 connecting the connecting piece 04 and chassis 06is easy to be broken, resulting in unusable chair, and even injury ofthe user.

SUMMARY OF THE INVENTION

The objective of this invention is to provide a type of office chairwith improved structure in view of the shortage of the presenttechnology; it has the advantages of simple structure, low productioncosts, easy assembly and good safety, etc.

To achieve the aforesaid goal, the office chair with improved structureincludes: chair back, seat cushion, base frame, L-shaped connectingpiece; among others, the vertical part and transversal part of theconnecting piece are connected with the chair back and seat cushionrespectively; there is a cylinder with a cylinder rod in the middle ofthe base frame, a piston pin in the cylinder rod work together with ahandle to realize the lifting and dropping of the seat cushion, thevertical part and transversal part of the connecting piece are directlyfixed at the back end of chair back and bottom side of chair seatrespectively; in addition, there is a fixing hole coordinating with thetop of cylinder rod at the corresponding position of the middle of theseat cushion on the transversal part of the connecting piece.

This invention simplifies the structure by adopting the method of directfixed connection between the transversal part of the connecting pieceand the seat cushion, which is convenient to assemble and reducesproduction costs; in addition, it enhances the connecting intensitybetween the transversal part of the connecting piece and the seatcushion, which strengthened the stability of the chair.

BRIEF DESCRIPTION OF THE INVENTION

FIG. 1 is the structure scheme of the present office chair;

FIG. 2 is the structure scheme I of this invention;

FIG. 3 is the structure scheme II of this invention.

DETAIL DESCRIPTION OF THE INVENTION

The following is just one good example of the implementation of thisinvention; it is not used to limit the protection scope of thisinvention.

Please refer to the Attached Diagrams 2 and 3, this invention includes:chair back 10, seat cushion 20, base frame 30 and connecting piece 40;there is a cylinder with a cylinder rod 50 fixed in the middle of thebase frame 30.

The Connecting piece 40 is L-shaped, there are several screw holes 401on its vertical part 41 and transversal part 42 respectively, thevertical part 41 of the connecting piece 40 may be directly fixed at theback end of the chair back 10 via the screw hole 401, while thetransversal part 42 is directly fixed at the bottom side of the seatcushion 20. To guarantee the intensity of the connecting piece 40, thewidth of the transversal part 42 of the connecting piece 40 is ⅓ to ¼ ofthat of the seat cushion 20 to enlarge the stressed area; and the lengthof the transversal part 40 of the connecting piece 40 is approximately ⅔of that of the seat cushion 20.

Because the connecting piece 40 is molded in one piece, and its verticalpart 41 and transversal part 42 are fixedly connected with chair back 10and seat cushion 20 respectively, which makes the seat back 10 and seatcushion 20 become one piece so this fixed connection is very stable;when the consumer is leaning on the seat back 10 and rocking back andforth, the stable connection between the connecting piece 40 and seatcushion 20 can be guaranteed, and the safety of this invention isenhanced.

A fixing hole 421 is arranged on the corresponding position of themiddle of the seat cushion 20 on the transversal part 42 of theconnecting piece 40, and the fixing hole 421 coordinates with the top ofthe cylinder rod 50. The cylinder rod 50 supports the connecting piece40 and seat cushion 20, the connecting piece 40 and seat cushion 20 maymove up and down with the cylinder rod 50. The fixing hole 421 can be arun-through hole and the shape of it matches with that of the top of thecylinder rod 50 so as to fix the cylinder rod 50 firmly. The matchbetween the fixing hole 421 and top of the cylinder rod 50 is tight fit.Metal or wood can be adopted as the materials for the connecting piece40; if wood is adopted, a strengthening sleeve 43 can be nested in thefixing hole 421 on the transversal part 42 of the connecting piece 40,and the shape of the casing of strengthening sleeve 43 matches with thatof the top of cylinder rod 50; during assembly, insert the top ofcylinder rod 50 into the casing of strengthening sleeve 43 to increasethe endurance of the fixing hole 421 against the top of cylinder rod 50.

In order to make the cylinder rod 50 coordinate better with theconnecting piece 40 and seat cushion 20, this invention made thefollowing improvements on the structure of cylinder rod 50: there is aconnecting hole on the outer wall of cylinder rod (50) and the front endof handle 51 is inserted into the connecting hole to coordinate with apiston pin inside the cylinder rod (50). Pushing the handle 51 againstthe piston pin inside the cylinder rod 50 to control the upward anddownward movements of the seat cushion 20.

1. An office chair with strengthened structure including: a chair back,a seat cushion, a base frame, a L-shaped connecting piece; a verticalpart and a transversal part of the L-shaped connecting piece beingconnected with the chair back and the seat cushion respectively; acylinder with a cylinder rod in the middle of the base frame, a pistonbin in the cylinder work together with a handle to realize the liftingand dropping of the seat cushion; the vertical part and the transversalpart of the L-shaped connecting piece being directly fixed at the backend of chair back and bottom side of chair seat respectively to avoidadditional connection means, thereby to create a strong connectionbetween the L-shaped connecting piece with the chair back and the chairseat; the transversal part of the L-shaped connecting piece having afixing hole located in the middle of the seat cushion, The fixing holeconnecting the top of the cylinder rod firmly.
 2. The office chairdescribed in the claim 1, wherein the vertical part and transversal partof the L-shaped connecting piece are directly fixed with the chair backand seat cushion respectively by screws.
 3. The office chair describedin the claim 2, wherein the width of the transversal part of theL-shaped connecting piece is ⅓-¼ width of the seat cushion and thelength is ⅔ length of the seat cushion.
 4. The office chair described inthe claim 3, wherein the material of the L-shaped connecting piece ismetal; the top of the cylinder rod is directly inserted into the fixinghole in tight fit.
 5. The office chair described in the claim 3, whereinthe material of the L-shaped connecting piece is wood, the fixing holeis embedded a strengthening sleeve, the top of the cylinder rod isinserted into the strengthening sleeve.
 6. The office chair described inthe claim 1, wherein there is a connecting hole on the outer wall of thecylinder rod and a front end of the handle is inserted into the cylinderrod through the connecting hole to work together with a piston pininside the cylinder rod for control hoist and recede of the seatcushion.
 7. The office chair described in the claim 5, wherein there isa connecting hole on the outer wall of the cylinder rod and a front endof the handle is inserted into the cylinder rod through the connectinghole to work together with a piston pin inside the cylinder rod forcontrol hoist and recede of the seat cushion.